EP 0954712 A4 20020306 - CONCRETE PIPES AND METHODS FOR THE MANUFACTURE THEREOF
Title (en)
CONCRETE PIPES AND METHODS FOR THE MANUFACTURE THEREOF
Title (de)
BETONROHRE UND VERFAHREN ZUR HERSTELLUNG
Title (fr)
TUYAUX DE BETON ET LEURS PROCEDES DE FABRICATION
Publication
Application
Priority
- US 9800890 W 19980120
- US 78678097 A 19970121
Abstract (en)
[origin: WO9831961A1] A concrete pipe and methods for forming the same are presented by this invention. The pipe includes an inner (12) and outer (18) sleeve separated by a spacer ring (14) which creates a void therebetween. Concrete (22) is poured within this void to solidify the pipe structure. The spacer ring (14) is formed by a plurality of interlocking ring forms (28) which have nesting members to allow for the interconnection thereof. In an alternative embodiment, interlocking forms are employed to form both the inner (12) and outer (18) surface of the pipe. These alternative forms provide convex nesting members (28) which form internal conduits between the inner (12) and outer (18) surfaces that accept reinforcing members (16) or connection members to interlock the forms to one another. Concrete (22) is then filled in these conduits and between the void of the inner (12) and outer (18) surfaces to solidify the pipe construction.
IPC 1-7
IPC 8 full level
F16L 9/08 (2006.01)
CPC (source: EP US)
F16L 9/08 (2013.01 - EP US)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 9831961A1
Designated contracting state (EPC)
AT DE DK FR GB IT NL
DOCDB simple family (publication)
WO 9831961 A1 19980723; AR 011553 A1 20000830; AU 6028498 A 19980807; EP 0954712 A1 19991110; EP 0954712 A4 20020306; US 5927346 A 19990727; ZA 98456 B 19990720
DOCDB simple family (application)
US 9800890 W 19980120; AR P980100264 A 19980121; AU 6028498 A 19980120; EP 98903535 A 19980120; US 78678097 A 19970121; ZA 98456 A 19980120